![]() ![]() See this thread: White Spotting of New Plaster Pools This type of problem usually takes several months to show up. ![]() may also display this non-removable deterioration. Disturbed zones along accent or surface tile, around fittings, etc. Beginning as excess porosity around the disturbed aggregate, soft spots expand and sometimes coalesce into larger affected areas as cement components are dissolved away over time. ![]() This late hard troweling disturbs surface aggregate, and added water penetrates around that aggregate and spreads laterally through the porous paste caused by accelerated shrinkage. White Spotting and Streaking – New Plaster (white or dark colored) may develop smooth white (lighter color) porous (soft) spots and streaks (sometimes incorrectly termed as “spot etching”) resulting from the addition of water to the hardened surface during late hard troweling in plaster containing excessive calcium chloride. See these threads: How White Pool Plaster Can Turn Gray Severe mottled color variation from calcium chloride or finishing issues may occur quickly once filled with water, or take several months to become visible. Late hard troweling can cause “trowel burn” which darkens the plaster color in localized areas. Gray (or grey) mottled discoloration (also known as “water entrapment” or “hydration”) is smooth to the touch and difficult to lighten, may be remedied by acid washing, sanding, or torching the surface, but these processes are generally detrimental to a plaster finish and the discoloration often returns later. Plaster Discolorations – New white pool plaster can discolor (darken or turn gray) from adding excessive calcium chloride set accelerator, from late hard troweling, from thin and thick areas due to an uneven shell, etc. ![]()
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